PHP remove commas from numeric strings

Question

In PHP, I have an array of variables that are ALL strings. Some of the values stored are numeric strings with commas.

What I need:

A way to trim the commas from strings, and ONLY do this for numeric strings. This isn't as straightforward as it looks. The main reason is that the following fails:

$a = "1,435";  if(is_numeric($a))     $a = str_replace(',', '', $a); 

This fails because $a = "1435" is numeric. But $a = "1,435" is not numeric. Because some of the strings I get will be regular sentences with commas, I can't run a string replace on every string.

Answer 1

Do it the other way around:

$a = "1,435"; $b = str_replace( ',', '', $a );  if( is_numeric( $b ) ) {     $a = $b; } 

Answer 2

Not tested, but probably something like if(preg_match("/^[0-9,]+$/", $a)) $a = str_replace(...)